Question

conta da questao: y=x2-7x+10

Answer 1

Zeros da Função: 

$y=x^2-7x+10$

$a=1;b=-7;c=10\\\\\\ \Delta=b^2-4ac\to \Delta=(-7)^2-4*1*10\to \Delta=49-40\to \Delta=9\\\\ x' \neq x''\\\\\\ x= \frac{-b\pm \sqrt{\Delta} }{2a} \to x= \frac{-(-7)\pm \sqrt{9} }{2*1} \to x= \frac{7\pm 3 }{2} \to \\\\\\ x'= \frac{7+3 }{2} \to x'= \frac{10 }{2} \to x'=5\\\\\\ x''= \frac{7-3 }{2} \to x''= \frac{4 }{2} \to x''=2\\\\\\\\ S= \left \{2;5\left \}$